September 30, 2022

Experimental implementation of secure anonymous protocols on an eight-user Quantum Key Distribution network

Experimental implementation of secure anonymous protocols on an eight-user Quantum Key Distribution network

Researchers experimentally demonstrated five information-theoretically secure anonymity protocols on an eight user city-wide quantum network using polarisation entangled photon pairs.

Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone is insufficient for high-security communications.

At the heart of these protocols is anonymous broadcasting, which is a cryptographic primitive that allows one user to reveal one bit of information while keeping their identity anonymous. For a network of n users, the protocols retain anonymity for the sender, given that no more than n − 2 users are colluding.

This is an implementation of genuine multi-user cryptographic protocols beyond standard QKD.

These anonymous protocols enhance the functionality of any fully-connected Quantum Key Distribution network without trusted nodes.

The paper has been published in npj Quantum Information.

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